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प्रश्न
Name the material of core in (a) an electric bell, (b) electromagnet, (c) a d.c. motor, (d) an a.c. generator and (e) a transformer.
उत्तर
Soft iron is used in all.
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संबंधित प्रश्न
Name the type of transformer shown in fig . What changes will you observe regarding the brightness of the lamp, if
(a) The no. of turns in the secondary is doubled?
(b) The part X of the transformer is removed?
( c) The core of the transformer is made out of copper?
(d ) The A.C. supply is replaced by D.C.?
Fill in the blanks by writing (i) Only soft iron, (ii) Only steel, (iii) Both soft-iron and steel for the material of core and/or magnet.
Electromagnet ______.
Answer the following in short.
Name a few common appliances that use electromagnets.
Describe a simple Experiment to demonstrate that there Exists a magnetic field around a current-carrying conductor.
State the purpose of the iron core.
State the energy change that takes’place in a D. C. motor.
State the function of a split ring in D.C. motor.
How does a magnetic field set up by a solenoid change when cross-sectional area of solenoid is increased?
Which magnet will you use?
Iron is to be separated from trash.
Write the answer in your word.
How is an electromagnet made?
